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X Probe Logo X50-16 Series | 0.050 [1.27] Centers | 0.160 [4.06] Full Stroke

Designed for loaded board testing.


50mil 160 Stroke Socketless Probe for loaded board testing

Spring Force

spring force chart

Probe Selection

QA Technology offers many combinations of probes. You can build your probe by selecting the tube style, tip style and spring force for your specific application.

If you have questions at any time during the process, contact us at (603) 926-0348.

P/N X50-PR P16
NOTE: Not all combinations are available. Please verify your part number to be sure it is valid.
If you need assistance, please call 603-926-0348.

Begin building your part number.

example: X50-PRP16S43PS

NOTE: P has already been selected for you as the default tube material.
      Current Rating1
Letter Material Average Resistance SS @ 204°C
 P Nickel silver/ID precious metal clad <  41 milliohms 7.8 Amps
NOTE: Your tip material is automatically coded for you based on your choice of tip style.
Digits Description
 S SteelHeat treated Steel/gold plated over nickel.
 B Heat treated BeCu/gold plated over nickel.
Select your tip style.
Use the drop-down menu at right to filter your choices by target type.
NOTE: Your plunger length is automatically coded for you based on your choice of tip style.
Letter Tip Style Availability Overall Probe Length (A) Plunger Length (B) at Test Position (C)
 H 39, 44 0.870 [22.10] 0.220 [5.59] 0.763 [19.38]
 P 43, 63, 6R, 8R, 9R 0.930 [23.62] 0.280 [7.11] 0.823 [20.90]
Select your spring force.
Letter Spring Force Preload @ 0.107 [2.72]
Material Cycle Life @
0.107 [2.72] Stroke
 L Low 1.1 [31g/0.31N] 3.0 [85g/0.83N] SS 300,000
 S Standard 1.5 [43g/0.42N] 4.5 [128g/1.25N] SS 300,000
 H High 2.0 [57g/0.56N] 6.0 [170g/1.67N] SS 100,000
Select your option (if required).
Letter Description
 N No probe lubrication. Removing probe lubrication greatly reduces cycle life and should only be used in applications requiring operating temperatures below -45°C or above 120°C.

1Current Rating is affected by spring material and lubrication choice. MW springs and lubrication both have a 120°C operating temperature limit. Use SS springs with no lubrication (-N) for testing up to 204°C. Before using probes near these limits, please refer to Current Carrying Capacity and Operating Temperature Application Notes.

2Maximum plunger OD should be used to calculate minimum guide plate clearance holes.

All specifications subject to change without notice. All dimensions are in [mm]. All spring forces are oz [gm/newtons]. US Patent No. 6,570,399 and 4,885,533